Earth moving device



Aug. 24, 1937. w. AUSTIN EARTH MOVING DEVICE Filed March 15, 1935 I N V EN TOR. [1167701957 17/105774 A TORNE Patented Aug. 24, 1937 UNITED STATES PATENT OFFICE EARTH MOVING mzvrcs Application March 15, 1935, Serial No. 11,267

Claims.

This invention relates to earth moving devices and has particular relation to hydraulic jacks and jack supporting structures and the method of producing such, which have been found par- 5 ticularly desirable for use with earth moving devices.

In the construction of earth moving devices of the character described in my copending application, Serial Number 742,368 filed September 5, 1933, of which the present application is a continuation in part, it is desirable that a hydraulic jack be provided which will be very low in manufacturing cost and which will be extremely simple and reliable in operation. Furthermore, it is desirable that the hydraulic jack act also as a spacing means for spacing certain members apart and also to provide a jack in which means are provided to permit the cylinder to swivel about on a transverse axis as desired.

I have provided such a jack and the entire jack may be built up from standard tube, plate and rod forms. A hydraulic jack, constructed according to my invention, may be assembled by welding or bolting the parts together.

A general object of my invention is to provide a simple, strong and reliable hydraulic jack structure.

A more specific object of my invention is to provide a hydraulic jack structure which may be constructed of standard plates, pipes and rods.

Another object of my invention is to provide a hydraulic jack structure which lends itself readily to assembly by welding or bolting the parts toether.

An important object of my invention is to provide a hydraulic jack cylinder not requiring the usual cylinder head fiange for bolting on a jack head.

- A further object of my invention is to provide a hydraulic jack cylinder suitable for employing a metallic cylinder head gasket for sealing under high unit pressure.

Another object of my invention is to provide a simple means for preventing abnormal distortion of cylinder walls during the welding process.

Another object of my invention is to provide a combination of hydraulic jack and spacing means.

Another object of my invention is to provide a simple and strong pivot means in order that the hydraulic jack may pivot about on a transverse axis.

Other and further features and objects of the invention will be more apparent to those skilled in the art up n a consideration of the accompanying drawing and following specification, wherein is disclosed a single exemplary embodiment of the invention, with the understanding, however, that such changes may be made therein as fall within the scope of the appended claims, without departing from the spirit of the invention.

In said drawing:

Figure 1 is a side elevational view, partly in elevation and partly in section, of a jack con- 10 structed according to one embodiment of my invention.

Figure 2 is a fragmentary perspective view of the head end of a cylinder of the jack shown in Figure 1.

Figure 3 is a view in perspective of the cradle or spacer means in which the hydraulic jack is supported.

Figure 4 is a view in perspective of the head of the hydraulic jack with a fragmentary por- 20 tion of the piston rod shown in place.

Figure 5 is an elevational view of the head alone taken generally along the line 5-5 of Figure 1; and

Figure 6 is a partial view illustrating a method 25 employed for holding the cylinder in shape while bolts are being welded to the cylinder.

Referring to the drawing, a jack constructed according to one embodiment of my invention is comprised of a cylinder ill, a cylinder end or 30 closure II, a cylinder head l2, a cradle l3, a piston l4, and piston rod l6,

The cylinder l0 may be of any desired material but in order to provide a structure which may be manufactured at a minimum of expense, I 35 preferably utilize standard welded steel tube. The inside wall of the tube may be ground to provide a perfectly cylindrical smooth surface so that the piston It may form a fluid-tight seal within the jack. The operative end Illa of the 40 cylinder I0 is ground off to present a true transverse circular end on the cylinder to form a perfect fit with the cylinder head l2. The opposite end lllb of the cylinder I0 is closed by means of a disc-like member H which is welded in place 45 in the end of the cylinder, a lip Ila being formed to insure a perfect circular wall of the cylinder during and after welding. The end closure H is drilled and tapped in order that a pipe fitting I! may be threaded into the end closure to permit 5 fluid to be forced into and withdrawn from the interior of the cylinder. The piston it may be of any desired construction, but the preferred structure here shown is comprised of a two part piston grooved to receive a split ring I la and a 55 leather cup washer Nb. This construction has been found in practice to afford the best seal with the cylinder wall. The piston rod i8 is threaded into the piston and passes through a suitable central opening in the cylinder head l2 and through a packing gland IS in the cylinder head. Any suitable connecting means, such as the yoke I9, may be engaged to the projecting end of the piston rod.

The cylinder head, better illustrated in Figures 4 and 5, is a substantially rectangular plate, both of whose dimensions are substantially greater than the outside diameter of the cylinder ill, in order that the cylinder head may be secured to the cradle i3 as hereinafter more particularly described. The front wall is provided with the boss Ilia and packing gland l8, beforementioned, for providing a seal between the piston rod l8 and the cylinder head l2. The rear face of the cylinder head- I 2 is provided with a circular groove 22 which is concentric with the opening 2| in the center of the head and this groove is of such dimension and diameter as to receive the end lOa of the cylinder ii). The cylinder head thus projects with the cylinder in what may be termed a lip. A packing ring 38 of soft copper or the like is disposed within the groove.

The cylinder is provided with a plurality of bolts 23 which are equally spaced about the outside of the cylinder with the threaded ends 23a projecting beyond the end of the cylinder sufficiently so that they may be passed through openings 24 in the cylinder head to thus afford means for bolting the cylinder head in place on the end of the cylinder. The bolts 23 are preferably secured to the outside wall of the cylinder ill by welding them thereto, as this construction provides a very inexpensive method of manufacture and permits the use of standard tube for the cylinder i0. To facilitate the welding and maintain the cylinder in true circular form, an unusual method of manufacture is employed? namely a metallic plug I00 is tightly inserted within the lip of the cylinder during the welding operation and allowed to remain therein until this member is sufficiently cool to prevent distortion. This method prevents the cylinder from being warped out of round during the welding and thus avoids difficulties which would later arise when the cylinder was being machined and when it was in service.

The cradle i3 is preferably a box-like structure open on both sides and is preferably comprised of top and bottom plates l3a and I3b, respectively, and end plates I30 and Kid. These plates are rectangular sections cut from standard steel plates. The and members No and Kid are slightly longer than the outside dimension between the plates Ba and I3!) and the plates I30 and |3d project slightly beyond the outside faces of plates l3a and l3b in order to afford projecting lips so that fillets 25 may be built up by depositing metal in the corners at the junctions of the plates. The plates are also welded to each other at the inner corners formed by the junctions of the plates, as indicated at 21.

The plates i3c and l3d are drilled centrally thereof, as indicated at 28, and stub-shafts 29 are placed in these openings and welded in place as indicated at 3i and 32. The plates I31: and l3b may be of a length such as to provide any desired spacing between the stub-shafts 29 and may project beyond the edge of the cylinder head i2. In this way the cradle l3 may be employed as a spacer for spacing apart the plates or other members in which stub-shafts 29 are held.

Bolts 33 are welded on the inner faces of the plates Ila and l3b with their threaded ends projecting beyond the edge of the cradle to a sufficient extent that they pass through the widely spaced openings 34 in the cylinder head in order that the cylinder head I2 may be bolted to the cradle 13. The cylinder head l2 may not entirely cover the open side of the cradle l3 but this, of course, does not make any difference. The cylinder head i2 may be drilled, as indicated at 36, and a pipe connection 31 welded within the opening 36 to afford meansfor introducing fluid to and discharging fluid from inside of the cylinder It).

It is apparent that my invention provides an extremely simple, strong and reliable hydraulic jack structure and mounting therefor which may be built up from standard tube, bolts, plates, rods and fittings at a minimum of expense. It is apparent that modifications may be made by those skilled in the art and such modifications may be made without departing from the spirit and scope of my invention as set forth in the appended claims.

I claim as my invention:

1. In a hydraulic jack, a cylinder head bolted to the cylinder, a box-like cradle adapted to surround the cylinder and open at both sides thereof, bolts secured to the inner faces of the cradle by welding them thereto, and means on the end of the cylinder head for securing the cylinder head to the cradle.

2. In a hydraulic jack, a cylinder formed of standard welded tubing, adisc like member welded to the cylinder, adapted to close off one end thereof and having an opening therethrough, a plurality of bolts welded to the cylinder about the opposite end, and a cylinder head adapted to be received upon the bolts and in close cooperative engagement with the cylinder, the said cylinder head having an opening therethrough for receiving a fitting for bringing fluid into the cylinder.

3. In a hydraulic jack, a cylinder formed of welded tubing, 9. disc-like member welded to the cylinder and adapted to close off one end thereof, a plurality of bolts welded to the cylinder about the opposite end, a cylinder head of substantially greater diameter than the cylinder, the cylinder head being adapted to be received on the bolts on the cylinder, a box-like cradle having a plurality of bolts welded to the inner faces thereof and the cylinder head being adapted to be received on said bolts to secure the jack assembly within the cradle.

4. In a hydraulic jack structure, a cylinder, a cradle member adapted to surround the cylinder, the cradle and cylinder having bolts extending parallel to the axis of the cylinder and a cylinder head adapted to be ,bolted over the end of the cylinder and the side of the cradle.

5. In a hydraulic jack structure, a cylinder, a cradle member surrounding the cylinder and spaced therefrom, and securing means on the outer wall of the cylinder and the inner side of the cradle member, the securing means projecting beyond the respective edges of the cylinder and cradle member and the cylinder head adapted to be secured on the end of the cylinder and the side of the cradle to form a closure for the cylinder.

' ELLSWORTH W. AUSTIN. 

